ITCO junk basket is used to catch the small junks from down hole,such as steel ball,tong, cutter,blade,hand tool and junk iron and so on.The principle is to use the mud of inverse well flushing with large circulating rate,high pressure to shock bottom well,so the junk suspensions move to push the basket fingers and go into the barrel.When stop the pump, the basket fingers restore their position to prevent the junk in the barrel coming out from the basket,achieve fishing.